Good question. I'd start by asking yourself why do you want it? Money motivation? Interested in the profession? Career growth opportunity? In today's Millenial culture, companies are turned off by candidates who may be a flight risk. I would go in saying that you want a career that you can be in for the long haul and have the passion to make a difference in their organization. Convey your interest in working with a successful organization that can help nourish your short term and long term goals. Answers like these go a long way.